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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e39c18427acab5bc0a0c20a988fc5626e75f31207c0357ffd64f960fd645ceb' 
  AND token = 'RMxCZug4bHjzOcedI4bxJIOdjruOC7/lGNTYiOZw0EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}