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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6222716c638ea74aa4c6dd5206ac9c6dfcae1045035c26ab1b322d17da94b2d2' 
  AND token = '/UhRpax592VgiuX7WpSfrAbkv42khNMvhgUMOZKdb+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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