SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2286ab4118c4578396b1d0f4003218b15074c6ac379f77c56eab8221b8400aa5' 
  AND token = 'glmSQpO9AK6ltqzYhV548tMypXFvgAPwzh1vlq5Il70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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