SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24ddafa69c77caff3e5e770116a249d31138638b6b7b7066c7560e0a0b68b4c3' 
  AND token = 'lZvM3XmBb+sB9pXf+jJjCM54ZrKsOE4KMDHWzSGXluE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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