SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1332621b8230d6b6ba5c490bb4eef66dac3d60c9088b677b0ef34bbb792dc33d' 
  AND token = 'lGK4STvS91VCJAAGBYKsJKzXlx58v7mXduint5SyDVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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