SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01d298d95319f441c5237e151313466f15670234766ab41c6e41662bdd8800fa' 
  AND token = '/jS2p+kKNK4kpx9VPgwBpYs54vu+NH6syvj7kh0m+ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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