SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca4e5e26eaba48a88efe914d52876d583f09b1ce77d4f72d463f786ee9bf099b' 
  AND token = 'Czmi+2Q4EhKgsYwKKL38CKZvXj6EvpnxDDn9CWWBDko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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