Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1525bf93dd097e7a92b9f39c7869feef5bb1f87de41bfebafb0e79d4b9cd7c63' 
  AND token = 'ugWQD0sburgtQMlfMhU0LDivjKZDseURQtj1g4It548=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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