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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54caea760c9e0239701ff27a47904cdc0fbe0ae8f1f281aac60b80f106886cb6' 
  AND token = 'wIiry79/tesCJUQlrQp/5iyHVp93hrIf5p5aLCQoUt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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