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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6b163da382cb93f0ee7f7db57528c72f8c820de52f18425fb5101c8b81c1d00' 
  AND token = '9nxM/ctfYzrTOIL472Hv/l5ia8ESaUPnEyCSO1FuVRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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