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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd74e8757c6ff29882b27d6f80cdbcbeeda07f0ee3245d34b390235cdcc41b8f' 
  AND token = '5l/QY9JqqXD/9MueInEkCn0eq/uFbulUxWwl1TOAZ/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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