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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b6ba5689b602532662e308a5c4de7322e0204a6b56c88a88db9ed11b9cc9a2e' 
  AND token = 'Hhe+Cqche8yVL8/iMdYIcHrLt8O0a63PlsPcIq2VrAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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