SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ce825203f264b5e08a9fd4394e1ec873617ef838576196f2b7f7552b7989f95' 
  AND token = 'SQYYXvkYBCpmSBZG/NQi7zOmd0ANhT/P9aU4pabp1dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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