SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3d05079031774355265c4a815a921af44f6f70a1d460d5332cbd3fbc8907dbb' 
  AND token = 'MldYGXFM00/CVSc80mcS+BzOVx7Xk8ma1JmgjRzEv3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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