SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15e25748f7f121c9b3560bc3432c8c63659d88f38ec71f64a7bbd383ea413dc2' 
  AND token = 'zkfyAZu+hw1mbqHnaQ2pvJHsycrLhM0uZlgyDDbmGTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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