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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c08d30eff749a1810839415ab8cc94e926b05832200f38674185eeaa59c267b' 
  AND token = 'oyEMyU6lMqKc9Kc9Njo4Wui5xxH/MBulHerXTomceL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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