SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5f5c6b4a14acdb584f29d7cb4d555a74ce7de8c66e076841895df4102ea7db6' 
  AND token = 'f38G+RvMu0pQh/r19mqbCDZ0Lr+ZAeIXHnGkvjZQOdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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