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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d92c842f4a6126bee32d0f0698e468ad600af8a8549c6b95724d60a387b3989' 
  AND token = '38Irf5Wr+5+XI5sEFUDKIFDUI1qSkfoCyaq+8TiPOEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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