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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2beb58c8a6fbf8ba7eaf475d1d4fc065e0bd314d5eadf25a4aab490ba95295bf' 
  AND token = 'PMeOYuPx0TAmSk+41M7rTcl7LkzwooUy/u6nE9E6Fl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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