SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '011d8fb1a7a35f5a529a537b9c110922ddb4f7c3d47944d2caa814701080ac93' 
  AND token = 't+t9SUg6YS2SL/mGiYIagByhL4kpjwWhMDWaCP/leBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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