SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '378d257e47d28bfbcaf43f969aff52f416273bcfb6f46d138528b231ac30a8a2' 
  AND token = 'XwB99/iMfdlgpkpbj9glXOJW7XjZJdkvQOqFM2bEq6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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