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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3de144b500f71f0f9d9e75dfe9508b76c7263bd61664c4bb9491737d219bca37' 
  AND token = 'W1pe76d7Fugkn2VZSmgRFDeu3ne4B97D0blbM8VubcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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