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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4881d0ba09fc7fbad1830cfa4de68494408700d3ecd924c3ddfc6d5f49f79653' 
  AND token = 'EBsXTvBqMj+Ya34yEtIKBncNyvKAUph7ehwo9TDbxoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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