SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7238107972643717621ce69fc8c6326a3e41d78d7b582d433b2154d5ca84570' 
  AND token = 'VDKFEDHElfZz0JmKvyN4YS2ccKzerhGTJff/iogF2LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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