SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88d95587f8d26e39e8928b59b9489db236c773ce61d0cc03a22cfa08ad655211' 
  AND token = 'MM3zHzDYKYQYcDk8wnG+cvfpWFtTdrJb6TuhKXqmRpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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