SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca99d182ba6ce4550ff35668ab651faf35f34c8d41c239aa41b8d426a2051d70' 
  AND token = 'fLOBRGielcNXMGs0KDZiA0o75Y/7JDBF6mURZo+1CTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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