SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2d94576f90eef57cb9de2734195c59768668ed777bf15531fe587af4c853e098' 
  AND token = 'gZje+Rz2h4EsVWFV+KH0thT9G7SJ5ubCTCnUZACxTJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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