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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36a4c80272471cfcc7ee58a4f824812c2eed5e2a01f24cb78d5f942ebb7ab850' 
  AND token = 'IMrFP1ojG/DceMBTlXtDoZfrq0PG9xxEtn9qUBkNugM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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