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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca03a46871dfd32ec8562b7e450e34b9c9c8651eab34b1396ec4cb4ddcc16b90' 
  AND token = 'tNFECF5VL8wbiQ8dCMSqsJ1RUVdxjGgakO+ciYXyFCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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