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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e115dc1ec85dd9e14c9e243d1fd0a8bdd416d9bd99eecde69f1a84364765dcc' 
  AND token = 'seEUnIbpl2oG9J2m0Key8TJqaGa5qu0cSI49Sxr7ke8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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