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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b303c212c6c5617d30837c062d29bf98f72c9ac517703ae823d0cda59ee3a86c' 
  AND token = '64jlxWClembXMWgnkwGcpwOxi1Imav48qOLOk1pzxbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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