SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03b129611257c018358f70f33874fe3263b48f48ca511a79bfa7898924b9e79f' 
  AND token = 'gXlU+xVMFEapH1bz3JWrA9dPBaYVFtX4Su5NlOevWXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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