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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1524dfd33755bfb310ccc0ca30af82e2dad61c208aacbcc798e168460377973f' 
  AND token = '2TScFPGIewkhNVoyyScSqlpEcLITiY+nZATkmoYL+uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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