SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd728c8ed8e4eb423ed665fa49590bb12ea1b12ecda8ec6377b711df873e4d938' 
  AND token = 'LRZ/FOKCPLQF1lFQzhcB0wHY2I5vhvzv42LBXKNsH8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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