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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '384b0ab0169a4e4fc594283ce9314cbc0a7bec8978140728c41ce3faa0b921b3' 
  AND token = 'apoSBLPsiJ4jJb9caclQjKVXyfUY0aX+GhfxVm+RSQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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