SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5206652065a8d6977b5dcf396d77c6c18aab74fd7521e860aa0bfbdd214e7094' 
  AND token = 'QOyQxCJUiXy/jlGdflLOX6dLaPv7AtixWJ55Vgs+CKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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