SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc59dce9b6755e2fa467f8fa94dafa5d0c3c98894b41ccf48cbc2c88a30584b4' 
  AND token = 'BYrqnRY1mYXgxoJzOIjl11j2qZeTSDLA692xjCBjJrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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