Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfdd3c1f8773d136fdcae404da4f277538ac1eeb3051a79e06ad1d278f149884' 
  AND token = 'FT6JH9IVaMJqydiTj8U83hjaC+CjiL7lIcGWOIs1Ou4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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