SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a660c23914a0160fbf427de4a3f7993ab15c3d583c3e0238ca5a8090e865bdf0' 
  AND token = 'p2byfYwQraOq/2JGDQ/vDnqoxojIzMFC1zHj0mfstV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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