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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5836dc3cf2aa61a33b8bd2eb7836c3d8132bb992e70dc5c9bbc0df05203fd726' 
  AND token = 'Sy+8vPDO3WK+Y2Et6XvEevuDbjZ2BFbivqgr/LZQ7sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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