SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97b562e97923b94cc2aa6901dfd30551d1eb5996788ceb1be5ffabeb0fb9deb2' 
  AND token = 'QvWWwHrFgYoYk7PDVqiNrvR7H8C2+EsJ0Ml7C2j3jyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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