SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3219f8612b740c416be8524ab54857dc2454ce4af89a760b08e7aefd8176a0b1' 
  AND token = 'vTF73oV2xP9cxz3aJ+p7KAVCKZnmJ053hY134tQjQuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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