SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2601e4f69004de96304688ee7585ac71fd48209ea41f14641eb64b5f0d95fff' 
  AND token = '2d3dv1fPILwTg2tQG+v8jzeYYq/ZdfA1+U1B/2kwqFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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