SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '46fde9c8c5711c932640f345a68d11af27a1e7c04c90751790355968683c6c13' 
  AND token = '/KZQvxdxN6cPYLp2MUwfBOB80uwgRP7+Po59waqu+1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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