SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67866938d4fb713986208e5c3e819193b695a25b2722a3fbf034b3e0b4e403c6' 
  AND token = 'mdNy1DeX3EuxeBs7YqqD3PxKkq4Kcw4ko+zQZG/9nCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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