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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cf687753ecd74ee58b0979cddbe66ce53740ce7545e64ce684645e3a60a1694' 
  AND token = '6Waq3APDBfRac5iXgN7b9zswIXT1X5KvLyyAkoPxGGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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