SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89508fb75f3f1c51077bed0a0bc54fe5f6ffc7100927bd6c1e723dea988c209a' 
  AND token = '3GuS+ErMxRBSKIP/zCevORMzgusuVbIHmZnqURCNc2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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