Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8fc0fdf0e2265d23bc19e560e8c0e6074b5874d8bf3cd976c6b7843b335c4f9' 
  AND token = 'aSPurAMci31C5NxSgo+iBI9Y3D1+nsPLmaTIetwg2VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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