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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b843a8d8f75682a5d15b35b23984d853ca99982d72f68d6e415cd22ded04527' 
  AND token = 'j0KNW9mSlF28GM3gWM8UC0Y2FUZ71IYnouWEfidooeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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