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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a944a692f29b92eabab28082f9c144c452118d94c025683cf1a7388cf1d0850d' 
  AND token = 'CPqEIia7kMm9ACLstGIHyzDrPjpg2oxrVNOhZ2ftx9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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