SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8201f917212f839e0916515776c6e6cb3fefdaacf9cce51159f56b75243975c' 
  AND token = 'vGAVnerJU0KBLvUTH7gxzk2IWPwjtkrBKJ3NOHkyY0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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