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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'acd4f50a90fa7f3452ed45696c0d1d81e1669ff49cd03d79b791e53e62645769' 
  AND token = 'rZnOI3+0/qPBl5gh+H81nDUhg+n0TRPrx6h6Dkyp6Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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