SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66ab1b5877f09b6c5ff6b423aa81952ecaedd825f791b63db7ec99082e37b470' 
  AND token = 'vLBtVYQ8ZjMwq7SOU250ptZ9U/7NPTb+XVgaETR60iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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