SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e43e8c219aaf21a747d8fd449f489025f417c23ff518a09b408ea404310a9942' 
  AND token = 'vhKjzxCY61KI7LWyzRHIU7tf6gszHBWG+iAqlXSSq98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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