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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '684cc7059f9ac6f3cfd895bd5e37ae5b4c4674d6e0d85f449da928d1bba30923' 
  AND token = 'skJ6y4JZAhC7oOoMQ/eWsKDCrpWYfmcMAEXZkIjn/1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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