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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9f9af3a764d6f88b2746f9de3e9c45453a04e9fc04e13149dae5e1c34e55cdc' 
  AND token = 'WL1F4q3J9K4YXKPSxWK1oXoTziFxIMmhw1oaI13piWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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