SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f39ef28f33d695d334b91ceddb85956d1219d72977e653e8b699ca46154c2d82' 
  AND token = '83joDYgObBNo+vQJ4jH0uDxm2zCvU4OLoRG7h97sDTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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