SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0018f8e686fc8926472e430d97e84bfa514f34259c038b4d488166428db1011f' 
  AND token = 'HS+/QfUUBkk2jNkV/1lKWNDwgDCCoNcYFjxrsAo0nGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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