SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4110bf00343d34bb983797d75a71d6f3219231fffeed995f8df8aafbd129dbef' 
  AND token = 'nC5RS9mAvJ+dli7g8hCzVbd9GUnzYR1lZq/HAcR7Q0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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