SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26b230000adafdd5812f5f9d21eaee284bc47838e771ad8ecc65c4974a37155c' 
  AND token = 'ZxIcOYdhpRu2/Gs6BskiUzzX3x7BYDmgwr1ob5jr2I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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