SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ddfaa33c486bc082973956883349d9248bb1d382dcabef36fbd9d4318c55e0b5' 
  AND token = 'wUT8+nVUC7O5WXFgfdqfdyLhFRuplXy7T0MUuNsZBL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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