SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '916f489b077d70b5dd69bc274f778fc6e754ed3f93fa7ec66c161939f3b1697b' 
  AND token = 'o7JVaVJyWk1P1YKiStwLSA2DgPB3tvCz3hDqipkaH8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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