SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ddd9194e0cf3b5dbc72bea84cec5c545abde1dcaf163201094f21278fb30605' 
  AND token = 'LZRw4mwnY4V6RKrNWXWXgEK4pZjqubZixXhhbGg7V6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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