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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34eb1195db07fa6f6c977efe57e7b6d7acb12c777e9467ad90ef2d55c3c27df8' 
  AND token = '//UcUj0RGOahgWNwnQAoinStArn9NiTNn76IDSlZkBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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