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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23a5b58159eb2321dfc6b5481e0926da1f53149447fba3d0cd79512288c92add' 
  AND token = 'Ny7/WMT/Oc6bwXew1cMUNkI9iyOZeVYGpJsTQ66Pi20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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