SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0882e5793a1e6fad7fd1b37d47c2fcb8f6c255439b98cc912087e8227cdbfe51' 
  AND token = 'UDQmBoMkczGrdJXkHgkFUdQ/xYITWWXwoHQwZufWnBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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