SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e95f2f437f8dc2171c9b6a23a60dc81492be8f59c712bb0a1d03483b2805776' 
  AND token = 'vXHGLZP0zr0RVUDGlF9BiUB68znJZwHRIJy8Fbxhmro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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