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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a96cdff57d4e9af556495941020cd10c7d04039162b02e9aa818fa8c850ae08' 
  AND token = 'GXNje5lruw97B06AZ+jzf3E/Lu+MjOfs23qorrPbSdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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