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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6de374b26dd3d1aeafa783764aa70227152474c83bb986bc7b60708fbc715de' 
  AND token = 'YvggprMC46R7fb7MT0jsG2payxxnzTdX5gUSifPqlwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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